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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1ea875acf6b2105133e16914019e02b8a961301bea6158562156502c0dd95bc9' 
  AND token = '/+l1w7FTf8aTjbHBA29jT7TB8nwcrbr/ngseiTlnVRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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