SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9051020011112812e40efe6e68a4f9f0b4a8d46e885d214f1d565823361f0bd9' 
  AND token = 'S5SVscmINElsWpgVj/VHSGOKDxIws9PmvqCufpl0v+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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