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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '603d2e13738d191642f547174014ac8ebd4dd112480f1e2ba0587e7e13d49563' 
  AND token = 'ebe7Lk6hIuVjgoOcZLoGJ3M4NsHoXT3BTjGuGXfzjvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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