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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10ab298201bab14a2f79909ae6d31446fe90c76f6ab51ee2d7db5ce50e220854' 
  AND token = 'fpgyS/Ak2QM7FrVF6ZUKczAXR33i37Vz1zwb4SV3H/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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