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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4bf05cb7a3fe1ed63a7632e5171f9312b8ae4e3042c76e451081e19747598550' 
  AND token = 'JnFPcKrgpWacuz4uU4BAlFSoYnWxFPiFi3cXsKigxJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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