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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6a0d6c42fcdada2cc814f1039c4273ac13fc7ec622af0ed06061ec5bae221e5a' 
  AND token = 'a1FPyFbe8UN1wYIxHt7gujHTE1y+xTcsqhsJkXxeG68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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