Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd0b43b0b92af53092ceacaf2469a276cfcc9042e4ef2e3a9eae181d21f3bccc5' 
  AND token = '53NW7QYu3SlEVeQ3Wf3EMeOmvoNmxA65wu4V+YiMc+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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