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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f5049d33d7e4fb7349ae71a9a6b1d7dac8bc13100fefd4c9ff3c3f55287193a7' 
  AND token = '8+hhpVDD8/+RTuFCodj9AQbrRhuBf1cUHxq8rvekzQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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