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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc5908773b9d21ed42b927a42fac88329ce7f96790d9dacd5d87f2ee7eb61882' 
  AND token = 'bHai6Hps596CUGXPvSDEymTdVJQmpBN4lH0e9uTF9bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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