Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d2a7c810b0d39f44a0428212440c8e8f455a3ad49bb05bd8ac7f8db6a8bc73' 
  AND token = 'CmmPggeQX80DY1kxxWDfnBXULVEvN7lUFW+GhcPbrhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}