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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c8ced0db23272236905e7b413fe5f20d61a9396e15a963dcb8fec9c6b82c29d4' 
  AND token = 'Ld2ASHKo07MQNqUrPD6Y2hCjTpjAfYdz9OUH3d1FeXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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