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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4a6088289a56b474f0a3efa5bc5355fc9e9300b1efa311bb31784e7e75fccd23' 
  AND token = 'G0Pa9iw7qocYMB/54Hvktx9bsOyYYmlqha4hOwnyWHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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