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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '86e5765df6bf7c8ec6c0772922466dd71617488d6529837b93a9ab3c1ce648c8' 
  AND token = 'ICdd7YfNP3fc+RXv5+9Z4WnxdhME2RbNurg7NIjvvas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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