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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd9fe30bc61542ac0962915141464922a7c750b84e87fa7920d212e868f27e1f' 
  AND token = 'yjeFUwiaDsOsMwg80OJT6PEHabaN+0ovD/MlQ22u6zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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