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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c931ee8a402bcde3d77c8150155826fc6aab10196f54efa317b2842de4058681' 
  AND token = '6e81iSbnPyUGoqXermtWs3clW8NNe3Ji0q5Wn28YauI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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