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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a4bbc2580015e8e550dc95ec421536c3ce6f4cc6b4760d66e4f0c6836be68554' 
  AND token = 'jkFPnwq1XHEPJEtB+M0nCLMThh7ZLOs4oPA28NHwb1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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