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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '883bebf02a9342a3f8fa49a8cdf443cf5329e365a3b6347c78436f5e75534b4f' 
  AND token = 'dGvpzUhDe344pjoDCh3TsA2L+2IIcmGcUlKAUyTmezk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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