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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca9bce9e02ae7ae94dea2cc4c4d904def1fc71345963aab18e25887cc8363613' 
  AND token = 'TnHqRIG4jGz7oteIhZmVNhjhRPmrC2aD2MWAJLU6Z0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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