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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1cc670646c54179c3900bd14e4556a82df35aa72eb2b8dc536feb3df511977c3' 
  AND token = '71PFxkGA+nAvqivThn+AfufGb8qH5BFNksyX9fPApGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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