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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9688a5817d6d0b83eac0118a8e665b9124e6aac71dad2fd29b1bb3d9b379a66c' 
  AND token = 'pW47RnNRnEeBlB4NwCWldRhcUacn0pQu5wsu7EvGcLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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