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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bd873a842a4aef5c6c2b26f046a2010c6af550042068d14a376384911117ff3d' 
  AND token = 'T0E5IdO865S/LCvl8C3OQ4D8MN5h29o/EO+4bXDJpF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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