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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8acf3d774e5558fad9e36e90663dc1c985b0aebeb1ff26f25f0b74d2bfe9fff4' 
  AND token = 'zZmjm2waTwJf4lpNMOj7NQW8ds+8tDgNRs9ZTiJpres=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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