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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9983088b9624b6c75a23b992d31698da1dcf0b734fda7b9767e1446971e2d87' 
  AND token = 'Tgt1dx/8r2dsTUi5EKMRT1vUMnTN12E/lJeV2GhzBXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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