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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd7002083c494834ecaeb4af26886197120edcd263470b9df717cadb6ce02e508' 
  AND token = 'Xj5vtA12eVbIoZ+grbaSXUvtnE0xWlUaROSakSW7JnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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