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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '440b1d28c2df9b2daa333c08f4ad7f86034e7501aa46f2296bfb1658ab48fe9d' 
  AND token = '7REYw4sC4FRD42Oj7Mpw25meGbZ8VtlgVh2VdncBGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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