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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a5bd63b152f8817abbf9ccab554c41e11062d8b938a3b9405ec6f454927ccd64' 
  AND token = '/ZLFUxgZlW7qurlkE/48xOwEj2eOaEJcMxd+X/4MHjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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