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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '77d8bae9d033f65ef088c1636319066e2d0276f026cace9c9a8101c09a0a068e' 
  AND token = 'tP2N0A/ylKPEGvK59g9WP3Pruk1lbxKcJJIJm4J0NEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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