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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5a0cefeea48d03d88bf45c711e697eb8a3228006f478affeeca205917685e893' 
  AND token = 'voSEkWj5I4x8kp8oEl2A7qMeuEBKz6MD8uqp67X4DXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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