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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c836b27d78fef9c1e7a52945e023058f73c0dae82b6eda8ec8b8f97d7af26bf5' 
  AND token = '1ApY5nQkXh4jW7xSDWaY7ypP/knrRcDNxmuO/QydFFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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