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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ec5996637937ebe32e7d48b07da300685d1354a6f3f9f58574b6ddee7df9afb' 
  AND token = '6oC0U03EhB6G4lM4iq1bysygylrFOGFm6MmCotne5x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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