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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6c100658c06ffc85004a0d4367c4e4b4d42e898d7649f4d7c7d06dfd6f6e4eb' 
  AND token = 'xMVNYzutad7SFIBIoh1rOmhFllFKtiVRQKJBFAK0aQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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