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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09cbef6d240d673dc455d78936d766ede6e8a084aed8dabf88d6745a40593f16' 
  AND token = 'PSKrADFtBxTqwUqtx9xokVDJ3UrjkUgFqS4gJrxTJ7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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