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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7ae23c89925ed35b841037947c699928c7ae5959ffea02c8a8acadcb674a6a9f' 
  AND token = '0xz10YYgdrFWAT2g+X42ywVF0Rp/2OopmLhc9yHPYLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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