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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2e56a04a53c72a20aa33af7056bfece490640bf456ad3d0aabc38e034aa380fc' 
  AND token = 'BQC1WAphVFQUlcjqWHa1nKCGYVKJ1OqSNJmak38JlAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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