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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b10822c6f85a57c7b1b615ea9e0f1fd3df9779ec80643e92d711a990e91ca867' 
  AND token = 'S6jLM7yYBffKg1c8f+JwRWbSTT2Qq1P6czP/SddARgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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