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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8cf48fce8fb392d01e3973fe45b3b2181c82cb7e6e4a0b40d91e4fb75e611b9a' 
  AND token = 'M4OcZn3LtWCACg9TGZ6y8CTqWLgh0ovEXSlLgK0pmZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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