SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4a18a7e426ff2fd825b6fe2829675efe090de347c8309d0d81855c144f5692ca' 
  AND token = 'aYAtkjdJNEgq/3suHawzT+nmZtWWoVze0E9XO2kBSF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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