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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b78fe0f9e1b8aaf089ce7bea14effd89833adfa85c0e8355da6bcfd598e7e385' 
  AND token = 'navu77fSmuxHSm4kIpK9/J9h1MSQP+j47p+emK5j1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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