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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e05ce1ee2da227307ccedf0989e6177eca4ce3323dc42a895f8cbf5c1ee9dbd5' 
  AND token = 'CeoJrhl5XNyCg34sXh/SKOpXd71kjMbD93fR9ekCe1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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