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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ad0e149665a1cdc9d0572fe42e3f7db925747fe0bd9d0b3977af9358047c4b1c' 
  AND token = 'h1Ay2uOlR0zAJLv1RDOwPvJMStxE1JVIINCQXAgtkrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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