SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0d0556d7fc64203a360ab5997222e19cf76cc0ba1d5d9345dcb29bf691cee6b5' 
  AND token = 'QTnrnRJBPgv8/iNEAoVz1vEPJ+KA6H38EIjj0EE/XyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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