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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd15ffaa3a547cf33daa198b808912ee899e753c84bd7704516f6a2ca358564d5' 
  AND token = 'fW/0nvsA686e794m+Sjy7cS25/K0D1MJJveg5DzKndE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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