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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '42bc7807797a97f5d0618c99603d7509f497b65d3f7fb17f80b18f5c9011d710' 
  AND token = 'AtEkH/VbNwGdJC8m4sLPVQNt8umpHQPmO9su3pE7RFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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