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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26729e3a54fe59c7d3a0bc078c4ab0193f357efd894574d8e61b980a5af18afd' 
  AND token = 'ufea5soa+7zTOC+RgKuzn+pTbRC0+Juh1ArJ74dX0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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