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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8dff475cdb3f725ed682dde1fe654864f9dad722c384fa8d2d32d3d6b65a0531' 
  AND token = 'egqjPUSuWjXEdpF+YfQ8L8qG72PMwPG4bQ5elRphkLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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