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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd36765fab0cc0b593d3c4a19bb7ec22fb4f179eddec80a5d4bbaf1c6d67cafc6' 
  AND token = 'DIEcUCa3on8nhMhoOEaktR5fGD29dpWlkOxm6ur53fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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