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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '329dcc7e82cc240601f27e4fa52fe5492b0f55a3812ce84bb374195f9c87049b' 
  AND token = 'W6rsVLRq+wiLAk3g9O2jSVcaDUJ+//6Oel59/entm/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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