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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '07ee8b56273f665b5b58fa869a26826df9d827df7c22e1930b0ebf1b61b984c5' 
  AND token = '92NdeyzT/PT+ezbhZWStPyRO/HYn/n6ZdVwI2mDh5/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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