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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cbe953703e46aa8c60a47afa5b59ff5feed637775a2f6e59f751e05736ada353' 
  AND token = 'elk2vI6n2VCbb9ZQVcHR2BVvd7toe9VFnHT6x9mNZCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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