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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '78f30a35e58ede1856b7f850ea47339b0a687870ce17393ce8478511205bf30e' 
  AND token = 'bKeLzajIDEsg8L8//GHTgplIm0FmgVn3bhbmty7ORwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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