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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '51030ed86d7af045ad98151ce4d3bc2a748ea0dd42d0a078b8342327a7609839' 
  AND token = 'NTfQyn6Q2Kf7J2tKULsAkcJ6Xq0PtnH0leEh/m9oAZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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