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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '390cee776c61f30db4cf7c8bbe0db81a7bbc29f857c64f302e1dd11e0662ff7d' 
  AND token = 'i28DU0oD6F7xnJIj8b9O6Mgk3C2uS7GmKPv0eQ48BRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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