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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4525355e1141f756ddcd5c65e11c7aa1dd0b6791623e56957a61ba6322c5550' 
  AND token = 'XwyAOglmeDcMHGXyRPz/8Ko2wUUD1+gHm1TnnxIERhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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