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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ac6eb2580c4515e644c62961ef77785aec095074c8506d21944f04c2e9d5975' 
  AND token = 'Mf/D35DorQViB0aIG062K6yCahUPWs/DUq0YwjIeHc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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