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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b6cfe70ee84b4ebe4191ed245e6da42879d17fb17bf406dc3c3cfd4903851526' 
  AND token = 'EWfUXaoT59YBXRwnCKA+0IjOqG251qgSAb8tURILygI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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