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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4584b098df5cb3d33dd8451ef58cd57c9866651fc61c5aaa1d1b3c10e7d84b5a' 
  AND token = 'rJkRJDSf09qIISKL7aYAG0jMwUKPdkQLIb9EzQ4vxQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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