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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd5baf9d53a8300bb98d4f8c805347af224fe72bed5a29d11f2e3a1080dfec82e' 
  AND token = 'sKqwwm01NAXrj4wzXtnKCu51CxkzdhdFptX0aAzGIjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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