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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b37d070c0d9e0f029e4348df45ea6f311c995884cfc15bd04076a2722522b6e' 
  AND token = 'Du12d5xefulsLszXVFXKMCDBPeeYjBs98+I67kweHQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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