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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c16c5205ad6a0a6e0a7d06ecd660ba585bef2d3a42709ac1f4f05139dd851f24' 
  AND token = 'CorFFSPoh0/u5z7B7zN3z/PKr9iQpm/oF861MTtjGSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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