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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4f7447dc38ae5318e41c1ed289a1cf4bba621be0c2934eff8e4dcef0c1243010' 
  AND token = '7VMeMtU96WcgkX4+mHuQNRXy6ZphpWgZIU8r7icfEqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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