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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '030c67b11fe87dfd81cb20c7d1b6cb3e106c6f5a8de83bd3c677ad1e7cb5c8b2' 
  AND token = 'K2mAgXJ5jfhjCMbjYZMcwNJI26kGlZr4ZOnMJxXBqlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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